Question

我一直在使用Spring数据和hibernate，我想知道什么是最好的类组织，避免浪费代码。这是我的实际结构：

    public interface FleetRepository extends JpaRepository<Fleet, Integer> {
}

然后我使用这个界面

public interface FleetServices {

     //Create one row into Fleet table, if id already exists this method executes an update
     public Fleet create(Fleet fleet);
     //Check if a fleet with given id already exists
     public boolean exists(int id);
}

因此我实施了它

@Service
public class FleetServicesImpl implements FleetServices{

    @Resource
    private FleetRepository fleetRepository;

    @Override
    @Transactional
    public Fleet create(Fleet fleet) {
         return fleetRepository.save(fleet);
    }

    @Override
    @Transactional
    public boolean exists(int id){
        return fleetRepository.exists(id);
    }
}

鉴于我有几个使用相同方法的类（例如save，create ...），我想创建一个用于所有这些方法的类通用，比如这个

public interface GeneralRepository<T, Id extends Serializable> extends JpaRepository<T, Id> {
    }

然后

public interface GeneralServices<T,Id> {
    //Create one row into T table, if id already exists this method executes an update
    public T create(T object);
    //Check if a row with given id already exists
    public boolean exists(Id id);
    //Find a row into T table by Id
    public T findById(Id id);
}

最后

public class GeneralServicesImpl<T, Id extends Serializable > implements GeneralServices<T, Id> {

    @Resource
    private GeneralRepository<T,Id> generalRepository;

    @Override
    @Transactional
    public T create(T object) {
        return generalRepository.save(object);
    }

    @Override
    @Transactional
    public boolean exists(Id id) {
        return generalRepository.exists(id);
    }

    @Override
    @Transactional
    public T findById(Id id) {
        return generalRepository.getOne(id);
    }

}

然后我将这个类用于我的FleetServicesImpl

@Service
public class FleetServicesImpl extends GeneralServicesImpl<Fleet, Integer> implements FleetServices  { 
}

所以在databaseServicesImpl

中

@Service

public class DatabaseServicesImpl实现DatabaseServices {

@Autowired
private FleetServices fleetServices;
@Autowired
private EcuServicesImpl ecuServices;

public DatabaseServicesImpl() {
}

@Override
public void archiveAcquisition() {
    ecuServices.create(new Ecu("MM"));
    Ecu ecuId=ecuServices.findById("MM");
    Fleet fleet=new Fleet(ecuId,"334","2.9",170,"5+","Full","4x2","MT");
    System.out.println(ecuId.getIdEcu());
    fleetServices.create(fleet);
}

} 但是我得到了这个例外

16：41：43.465 ERROR o.s.web.context.ContextLoader - 上下文初始化失败 org.springframework.beans.factory.BeanCreationException：创建名为＆＃39; databaseServicesImpl＆＃39;的注册自动连接依赖项失败;嵌套异常是org.springframework.beans.factory.BeanCreationException：无法自动装配字段：private com.mkyong.services.EcuServicesImpl com.mkyong.services.DatabaseServicesImpl.ecuServices;嵌套异常是org.springframework.beans.factory.BeanCreationException：创建名称为＆＃39; ecuServicesImpl＆＃39;时出错：资源依赖注入失败;嵌套异常是org.springframework.beans.factory.BeanCreationException：创建名称为＆＃39; generalRepository＆＃39;的init时出错：init方法的调用失败;嵌套异常是java.lang.IllegalArgumentException：不是托管类型：class java.lang.Object 在org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java:334）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean（AbstractAutowireCapableBeanFactory.java:1214）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:543）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:482）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:305）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:301）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:196）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons（DefaultListableBeanFactory.java:772)~ [spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:834）〜[spring-context-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:537）〜[spring-context-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext（ContextLoader.java:446）〜[spring-web-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.web.context.ContextLoader.initWebApplicationContext（ContextLoader.java:328）〜[spring-web-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.web.context.ContextLoaderListener.contextInitialized（ContextLoaderListener.java:107）[spring-web-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.apache.catalina.core.StandardContext.listenerStart（StandardContext.java:4727）[catalina.jar：8.0.26] at org.apache.catalina.core.StandardContext.startInternal（StandardContext.java:5167)[catalina.jar:8.0.26] 在org.apache.catalina.util.LifecycleBase.start（LifecycleBase.java:150）[catalina.jar：8.0.26] at org.apache.catalina.core.ContainerBase $ StartChild.call（ContainerBase.java:1408)[catalina.jar:8.0.26] at org.apache.catalina.core.ContainerBase $ StartChild.call（ContainerBase.java:1398)[catalina.jar:8.0.26] at java.util.concurrent.FutureTask.run（FutureTask.java:266)[na:1.8.0_60] 在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142）[na：1.8.0_60] at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:617)[na:1.8.0_60] 在java.lang.Thread.run（Thread.java:745）[na：1.8.0_60] 引起：org.springframework.beans.factory.BeanCreationException：无法自动装配字段：private com.mkyong.services.EcuServicesImpl com.mkyong.services.DatabaseServicesImpl.ecuServices;嵌套异常是org.springframework.beans.factory.BeanCreationException：创建名称为＆＃39; ecuServicesImpl＆＃39;时出错：资源依赖注入失败;嵌套异常是org.springframework.beans.factory.BeanCreationException：创建名称为＆＃39; generalRepository＆＃39;的init时出错：init方法的调用失败;嵌套异常是java.lang.IllegalArgumentException：不是托管类型：class java.lang.Object 在org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java：571）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.annotation.InjectionMetadata.inject（InjectionMetadata.java:88）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java：331）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] ...省略了22个常用帧由以下原因引起：org.springframework.beans.factory.BeanCreationException：创建名称为＆＃39; ecuServicesImpl＆＃39;时出错：资源依赖注入失败;嵌套异常是org.springframework.beans.factory.BeanCreationException：创建名称为＆＃39; generalRepository＆＃39;的init时出错：init方法的调用失败;嵌套异常是java.lang.IllegalArgumentException：不是托管类型：class java.lang.Object 在org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues（CommonAnnotationBeanPostProcessor.java:311）〜[spring-context-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean（AbstractAutowireCapableBeanFactory.java:1214）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:543）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:482）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:305）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:301）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:196）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates（DefaultListableBeanFactory.java:1145）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency（DefaultListableBeanFactory.java:1069）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency（DefaultListableBeanFactory.java:967）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] 在org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:543）〜[spring-beans-4.2.1.RELEASE.jar：4.2.1.RELEASE] ...省略了24个常用帧引起：org.springframework.beans.factory.BeanCreationException：创建名称为＆＃39; generalRepository＆＃39;的init时出错：init方法的调用失败;嵌套异常是java.lang.IllegalArgumentException：不是manageset 29,2015 4:41:43 PM org.apache.catalina.core.StandardContext listenerStart

Answer 1

Quoting Oliver Gierke（Spring Data Project Lead）：

您获得的最后一个异常实际上表明您的JPA设置存在问题。 “不是托管bean”意味着不是JPA提供者所知道的类型。如果您正在设置基于Spring的JPA应用程序，我建议您在已配置为包含JPA实体的程序包的LocalContainerEntityManagerFactory上配置“packagesToScan”属性。或者，您可以在persistence.xml中列出所有实体类，但这通常更麻烦。

确保您的Spring配置设置正确，似乎并非所有类都被Spring识别。

要添加，heres an answer by Oliver关于Spring JPA中的通用存储库，因为您似乎正在使用它。

将JpaRepository与Spring数据和Hibernate一起使用

1 个答案: